Pump.



G. L. McDERMOTT.

PUMP.

APPLICATION FILED SEPT. 24. I913.

1,164,831. Patented Dec. 21, 1915.

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%W INVENTOR.

i. ATTORNEY.

G. L. McDERMOTT.

PUMP.

APPLICATION HLED SEPT. 24. 1913.

P31611161 De0.21,1915.

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'COLUMBIA PLANQGRAPH C0,.WASH1NGTON. n. c.

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GEORGE MQDERMOTT, OF DENVER, COLORADO.

PUMP.

Patented-Dec. 21, 1915.

I 1,164,831. Specification of Letters. Patent.

Application fil'edseptember 24, 1913. Serial No. 791,478.

To all whom it may concern .1 Q

Be it known that I, GEORGE L. MODERMOTT, a citizen of the United States, residing in the city and county of Denver and State of Colorado, have invented certain new and useful Improvements in Pumps; and I do declare the following to be a full, clear, and exact descriptionof the invention, such as will enable others skilled. in the art to which it appertains to make and use the same, reference being had to'the accompanying drawings, andtothe letters and figures of reference marked thereon, this specification. I I

.My invention relates to improvements in force pumps, my ing more especially adapted, for use where a plurality of cylindersare employed.

An important feature of my improved construction lies in the speclal construction and; arrangement of the valve, the operation of the latter and the construction of its seat,.

which is equipped-withports respectively in anda single discharge port.

communication with the several cylinders with which the. pump is provided. The valve is provided with'a single suction port There is a single passage leading from each cylinder to one of the ports of theval'veseat, the lat cause the discharge and ter being stationary. come alternately suction. and discharge passages and,,-through the medium of the ports in the valve seat,.are alternately brought into communication. with. the suction and discharge ports, of the, valve. operated from the crankshaft of the pump, whereby rotary movement is imparted thereto and its action brought, into synchronism with the movement of the pump plungers, the operjation, of the valve and. the movement offthese plungers being properly timed to suction ports of the valve to be successivelyv and "alternately brought into communication with-the ports of the valve seat. The, construction is so arrangedithat the suction and discharge ports of, the, valve overlap the ports of the valve seat so that, before the suction ordi'scharge ceases through one, port, of the valve seat,

it commences through another, port of the valve seat,.whereby the discharge of fluid is which form a part of improved construction be- These passages be- The valve is.

the pump cylinders is accomplished, the op-v eration of the cooperating ports being properly tuned for the purpose. It will also be observed that the construction is exceedingly simple, very eifective and economical in operation. It is also compact, which is an important feature, as it is adapted to occupy comparatively small space, considering its capacity.

a In order to minimize the cost of repair, the valve and its seat are each equipped with a wearing plate or disk which may be discarded, and a new one substituted at a Very small cost, thus virtually renewing the valve and itsseat.

Having briefly outlined my improved construction, I will proceed to describe the same in detail, reference being made to the accompanying drawing, in which is illustrated an embodiment thereof.

In this drawing-Figure 1 is a vertical section taken through my improved pump, cutting the cylinders longitudinally. Fig. 2 1s a horizontal section taken through the structure on the line 22, Fig. 1, cutting the cylinders just above their bottom ports and the valve casing just above the seat. Fig. 3 is a sectional detail view of the valve, taken through its two ports. Fig. 4. isa perspective view of the valve. Fig. 5 is an underneath view of'the valve, or a view looking in the direction of arrow 5, Fig. 3. Fig. 6 is a detail view of the wearing disk or plate which is applied to the bottom of the valve when the parts are assembled. Fig. 7 is a similar wearing disk or plate secured to the valve seat. Fig. 8 is a detail view of the valve mechanism substantially identical with cranks 9 of a crank shaft 10, having a pulley 12 for operating purposes. The extremity of the crank shaft opposite that where the pulley 12 is located isprovided with a bevel gear 13 meshing with a similar gear 14 fast on a shaft 15 to whose lower extremity is secured as shown at 16, a rotary valve 17, the latter beingprovided witha suction port 18 and a discharge port 19. The shaft or valve stem 15 passes-through a stufiing box 20 mounted on a housing 21 arranged above the valve casing 22 and provided with anoutlet port 23 for the water, air or other fluid with which the pump is employed. i

As shown in the drawing, the discharge port 19'extends through thevalve'f'rom top to bottom and in cross sectional area it is curved to conform to the curvature'of the outer surface of the valve. The suction port of the valve as shown in the drawing has two openings 24 and 25, the opening 24 being central and constantly in communica'- tion with the inner extremity of an inlet passage 57 formed in the solid framework of the pump. The opening 25 of the valve is elongated preferably to conform with the outer curvature of the valve, its area being substantially the same as that of the disa charge port 19. During the rotary action of the valve, this opening 25 is successively brought it to communication with ports 26,

28 and 27 formed in the valve seat 7, these ports being respectively in communication tially according to the number of plungers with the cylinders 2, 3 and 4, through the medium of passages 29, 30 and 31, the ex-.

tremities of thesepassages adjacent their respective cylinders being in register. with ports. 32, 33 and 34 formed in the bottoms of the cylinders.

The bottom of the valve is preferably p vided with a wearing plate or disk 35 which may be secured thereto by meansof suitable fastening devices passed through perforations 36. This wearing plate is provlded with openings 37, 38 and 39, constructed 1 and arranged to register with theopenings 25 and 24 and with the lower extremity of the port 19 of the valve respectively. The

valveseat is also equipped with a similar wearing plate 40 which is detachably connected with the valve seat proper, by means of suitable fastening devices passed through perforations 41. This wearing plate is also provided with openings 42, 43 and 44, and 58, arranged to register with the ports 26, 27

and 28,. and the inner extremity of the passage 57, respectively, of the valve seat.

When the pump 1s in operation, the crank shaft 10 is rotated to cause the plungers to reciprocate in their respective cylinders, the

pitmen being connected with the cranks 9 of the shaft and properly spaced circumferenand cylinders employed. With a pump hav ing three cylinders, as illustrated in the drawing, the cranks would be spaced 120 degreesapart. The crankshaft is rotated H to cause the valve 17 to rotate -within'its I,

casing,-it being assumed for the purposes of this specification,

in the direction'of arrow a, injFig. 2.

Assumingthat the pump is in operation,

and that the valveis'in the positionillustrated in Fig 1, the plungers of thexcylinshown, that is to say, the plunger of the cylinder:2 will be descending and forcing hat therotaryiaction is V 'ders will be approximately in the positions 7 V the fluid therein through the passage 29, the i port 19 and the chamber 45 within thehousv ing 21 and out of said chamber through the v outlet opening 23. ,Atthe same time, the

piston 0f the cylinder'4is moving upwardly and the suction acts through the port 34, the passage 31, .the valve seat port 28, the valve port 18' and the; passage 57 to draw the fluid into the cylinder 4. The plunger of the cylinder '3, it maybe assumed, has just completed its downward stroke and commenced its upward 'movement,'whereby fluid will be drawn thereinto through the port 27, since the opening 25 ofthe'port 18 of the valve overlaps'the two ports 28-Land 27 of the valve seat. In any event, the operation of the parts is so Ttimed that the plungers operatein. synchronism with 'thej rotary ac-1 tion of the valve; and as there are three:

plungers illustrated inthe drawing and their" cranks are spaced 120' degrees apart", two of the plungers must be moving downwardly or upwardly during the ,wholeztim'e except the instant that they areistopped at their upward or downward limit-of movement to be- I gin the stroke inth'e oppositedirection.

For this reason, both'the suction and discharge overlap two ports of the valve seat during the time that two plungers of the cylinders ports of the-valve are arranged to are moving in the Isame'direction for either-1,

suction or discharge purposes.

While in the drawing, I have illustrated charge port',thevalve, being rotatableto bring its ports successively and'alternately into communicatlon' with the ports of the, valve seat lnsuch a manner that one of said valve.

valve seat for thepurpo'se set'forth.

1 25 j ports always'overlap two of the ports in the v lt pl n p mp, t m- L bination with thefcylinders and plungers I therein, of "a rotary valve having a single suction port and a single discharge port, a valve always overlaps two of the valve seat valve seat having ports in communication ports. i 10 with the respective cylinders and means for In testimony whereof I affix my signature operating the valve and plungers in properly in presence of two witnesses.

5 timed relation whereby the ports of the valve GEORGE L. MCDERMOTT.

are brought into communcation with the Witnesses: ports of the valve seat in such a manner that ANNA L. LEI-IMAN, either the suction or discharge port of the v A. J. OBRIEN.

- Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, I). C. 

